Get ready to add another big time e-reader partnership to the list: iRex is set to announce later today a deal that will bring its latest DR800SG E-Ink slab to Best Buy with unlimited Verizon 3G data on board. The $399 e-reader with 8.1-inch touchscreen arrives as rumored with the ability to wirelessly download digital books from Barnes & Noble's e-bookstore in addition to over 1,100 newspapers from Newspapers Direct -- it'll also handle any books downloadable in the ePub format. The 3G goodness comes via a Gobi radio from Qualcomm -- right, that means HSDPA data too, allowing owners to download data while traveling abroad. Take that Kindle. The DR800SG is expected to arrive in US Best Buy stores next month. We'll be going hands-on with it later today where we'll have plenty of pics and the full suite of specs.

Update: iRex has dropped a picture onto its home page. Is that stylus to scale?